Finding the Fourth Proportional to 129,156.98, 178,238.78 and 71,016.17

Step by Step Solution

1. Step 1: Write the proportion equation
   129,156.98 : 178,238.78 = 71,016.17 : x
2. Step 2: Convert to fraction form
   129,156.98/178,238.78 = 71,016.17/x
3. Step 3: Cross multiply
   129,156.98x = 178,238.78 × 71,016.17
4. Step 4: Simplify right side
   129,156.98x = 12,657,835,501.07
5. Step 5: Solve for x
   x = 12,657,835,501.07/129,156.98
6. Step 6: Final answer
   x = 98,003.50