Finding the Fourth Proportional to 359,758, 539,663.16 and 138,142

Step by Step Solution

1. Step 1: Write the proportion equation
   359,758 : 539,663.16 = 138,142 : x
2. Step 2: Convert to fraction form
   359,758/539,663.16 = 138,142/x
3. Step 3: Cross multiply
   359,758x = 539,663.16 × 138,142
4. Step 4: Simplify right side
   359,758x = 74,550,148,248.72
5. Step 5: Solve for x
   x = 74,550,148,248.72/359,758
6. Step 6: Final answer
   x = 207,223.05