Finding the Fourth Proportional to 128,238.52, 176,978.32 and 70,876.61

Step by Step Solution

1. Step 1: Write the proportion equation
   128,238.52 : 176,978.32 = 70,876.61 : x
2. Step 2: Convert to fraction form
   128,238.52/176,978.32 = 70,876.61/x
3. Step 3: Cross multiply
   128,238.52x = 176,978.32 × 70,876.61
4. Step 4: Simplify right side
   128,238.52x = 12,543,623,232.47
5. Step 5: Solve for x
   x = 12,543,623,232.47/128,238.52
6. Step 6: Final answer
   x = 97,814.78