Finding the Fourth Proportional to 56,878.28, 85,251 and 42,793.07

Step by Step Solution

1. Step 1: Write the proportion equation
   56,878.28 : 85,251 = 42,793.07 : x
2. Step 2: Convert to fraction form
   56,878.28/85,251 = 42,793.07/x
3. Step 3: Cross multiply
   56,878.28x = 85,251 × 42,793.07
4. Step 4: Simplify right side
   56,878.28x = 3,648,151,584.32
5. Step 5: Solve for x
   x = 3,648,151,584.32/56,878.28
6. Step 6: Final answer
   x = 64,139.63