Finding the Fourth Proportional to 142,040.12, 213,141.58 and 57,784.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,040.12 : 213,141.58 = 57,784.72 : x
2. Step 2: Convert to fraction form
   142,040.12/213,141.58 = 57,784.72/x
3. Step 3: Cross multiply
   142,040.12x = 213,141.58 × 57,784.72
4. Step 4: Simplify right side
   142,040.12x = 12,316,326,520.66
5. Step 5: Solve for x
   x = 12,316,326,520.66/142,040.12
6. Step 6: Final answer
   x = 86,710.20