Finding the Fourth Proportional to 56,856.77, 85,215.98 and 40,221.60

Step by Step Solution

1. Step 1: Write the proportion equation
   56,856.77 : 85,215.98 = 40,221.60 : x
2. Step 2: Convert to fraction form
   56,856.77/85,215.98 = 40,221.60/x
3. Step 3: Cross multiply
   56,856.77x = 85,215.98 × 40,221.60
4. Step 4: Simplify right side
   56,856.77x = 3,427,523,061.17
5. Step 5: Solve for x
   x = 3,427,523,061.17/56,856.77
6. Step 6: Final answer
   x = 60,283.46