Finding the Fourth Proportional to 128,402.76, 177,196.28 and 71,810.52

Step by Step Solution

1. Step 1: Write the proportion equation
   128,402.76 : 177,196.28 = 71,810.52 : x
2. Step 2: Convert to fraction form
   128,402.76/177,196.28 = 71,810.52/x
3. Step 3: Cross multiply
   128,402.76x = 177,196.28 × 71,810.52
4. Step 4: Simplify right side
   128,402.76x = 12,724,557,008.87
5. Step 5: Solve for x
   x = 12,724,557,008.87/128,402.76
6. Step 6: Final answer
   x = 99,098.78