Finding the Fourth Proportional to 248,212,189.71, 372,059,650.01 and 138,877,061.31

Step by Step Solution

1. Step 1: Write the proportion equation
   248,212,189.71 : 372,059,650.01 = 138,877,061.31 : x
2. Step 2: Convert to fraction form
   248,212,189.71/372,059,650.01 = 138,877,061.31/x
3. Step 3: Cross multiply
   248,212,189.71x = 372,059,650.01 × 138,877,061.31
4. Step 4: Simplify right side
   248,212,189.71x = 51,670,550,824,721,528
5. Step 5: Solve for x
   x = 51,670,550,824,721,528/248,212,189.71
6. Step 6: Final answer
   x = 208,170,883.49