Finding the Fourth Proportional to 139,969,212.10, 209,953,818.15 and 139,969,212.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,969,212.10 : 209,953,818.15 = 139,969,212.10 : x
2. Step 2: Convert to fraction form
   139,969,212.10/209,953,818.15 = 139,969,212.10/x
3. Step 3: Cross multiply
   139,969,212.10x = 209,953,818.15 × 139,969,212.10
4. Step 4: Simplify right side
   139,969,212.10x = 29,387,070,503,842,180
5. Step 5: Solve for x
   x = 29,387,070,503,842,180/139,969,212.10
6. Step 6: Final answer
   x = 209,953,818.15