Finding the Fourth Proportional to 287,736.40, 431,667.82 and 88,072.18

Step by Step Solution

1. Step 1: Write the proportion equation
   287,736.40 : 431,667.82 = 88,072.18 : x
2. Step 2: Convert to fraction form
   287,736.40/431,667.82 = 88,072.18/x
3. Step 3: Cross multiply
   287,736.40x = 431,667.82 × 88,072.18
4. Step 4: Simplify right side
   287,736.40x = 38,017,925,943.25
5. Step 5: Solve for x
   x = 38,017,925,943.25/287,736.40
6. Step 6: Final answer
   x = 132,127.62