Finding the Fourth Proportional to 287,665.34, 431,515.32 and 87,987.46

Step by Step Solution

1. Step 1: Write the proportion equation
   287,665.34 : 431,515.32 = 87,987.46 : x
2. Step 2: Convert to fraction form
   287,665.34/431,515.32 = 87,987.46/x
3. Step 3: Cross multiply
   287,665.34x = 431,515.32 × 87,987.46
4. Step 4: Simplify right side
   287,665.34x = 37,967,936,762.78
5. Step 5: Solve for x
   x = 37,967,936,762.78/287,665.34
6. Step 6: Final answer
   x = 131,986.48