Finding the Fourth Proportional to 231,072.16, 318,875.52 and 129,091

Step by Step Solution

1. Step 1: Write the proportion equation
   231,072.16 : 318,875.52 = 129,091 : x
2. Step 2: Convert to fraction form
   231,072.16/318,875.52 = 129,091/x
3. Step 3: Cross multiply
   231,072.16x = 318,875.52 × 129,091
4. Step 4: Simplify right side
   231,072.16x = 41,163,959,752.32
5. Step 5: Solve for x
   x = 41,163,959,752.32/231,072.16
6. Step 6: Final answer
   x = 178,143.31