Finding the Fourth Proportional to 128,249.31, 176,978.56 and 70,885.70

Step by Step Solution

1. Step 1: Write the proportion equation
   128,249.31 : 176,978.56 = 70,885.70 : x
2. Step 2: Convert to fraction form
   128,249.31/176,978.56 = 70,885.70/x
3. Step 3: Cross multiply
   128,249.31x = 176,978.56 × 70,885.70
4. Step 4: Simplify right side
   128,249.31x = 12,545,249,110.59
5. Step 5: Solve for x
   x = 12,545,249,110.59/128,249.31
6. Step 6: Final answer
   x = 97,819.23