Finding the Fourth Proportional to 56,912.62, 78,560.94 and 42,806.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,912.62 : 78,560.94 = 42,806.20 : x
2. Step 2: Convert to fraction form
   56,912.62/78,560.94 = 42,806.20/x
3. Step 3: Cross multiply
   56,912.62x = 78,560.94 × 42,806.20
4. Step 4: Simplify right side
   56,912.62x = 3,362,895,309.83
5. Step 5: Solve for x
   x = 3,362,895,309.83/56,912.62
6. Step 6: Final answer
   x = 59,088.75