Finding the Fourth Proportional to 261,915.42, 392,875.60 and 143,522.12

Step by Step Solution

1. Step 1: Write the proportion equation
   261,915.42 : 392,875.60 = 143,522.12 : x
2. Step 2: Convert to fraction form
   261,915.42/392,875.60 = 143,522.12/x
3. Step 3: Cross multiply
   261,915.42x = 392,875.60 × 143,522.12
4. Step 4: Simplify right side
   261,915.42x = 56,386,339,008.27
5. Step 5: Solve for x
   x = 56,386,339,008.27/261,915.42
6. Step 6: Final answer
   x = 215,284.53