Finding the Fourth Proportional to 56,677.97, 78,221.12 and 42,312.87

Step by Step Solution

1. Step 1: Write the proportion equation
   56,677.97 : 78,221.12 = 42,312.87 : x
2. Step 2: Convert to fraction form
   56,677.97/78,221.12 = 42,312.87/x
3. Step 3: Cross multiply
   56,677.97x = 78,221.12 × 42,312.87
4. Step 4: Simplify right side
   56,677.97x = 3,309,759,870.25
5. Step 5: Solve for x
   x = 3,309,759,870.25/56,677.97
6. Step 6: Final answer
   x = 58,395.88