Finding the Fourth Proportional to 139,404,733.40, 209,107,100.10 and 128,257,059.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404,733.40 : 209,107,100.10 = 128,257,059.80 : x
2. Step 2: Convert to fraction form
   139,404,733.40/209,107,100.10 = 128,257,059.80/x
3. Step 3: Cross multiply
   139,404,733.40x = 209,107,100.10 × 128,257,059.80
4. Step 4: Simplify right side
   139,404,733.40x = 26,819,461,842,130,284
5. Step 5: Solve for x
   x = 26,819,461,842,130,284/139,404,733.40
6. Step 6: Final answer
   x = 192,385,589.70