Finding the Fourth Proportional to 142,156.64, 213,308.76 and 57,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,156.64 : 213,308.76 = 57,978.56 : x
2. Step 2: Convert to fraction form
   142,156.64/213,308.76 = 57,978.56/x
3. Step 3: Cross multiply
   142,156.64x = 213,308.76 × 57,978.56
4. Step 4: Simplify right side
   142,156.64x = 12,367,334,740.19
5. Step 5: Solve for x
   x = 12,367,334,740.19/142,156.64
6. Step 6: Final answer
   x = 86,997.94