Finding the Fourth Proportional to 31,025.61, 42,840.23 and 21,577.77

Step by Step Solution

1. Step 1: Write the proportion equation
   31,025.61 : 42,840.23 = 21,577.77 : x
2. Step 2: Convert to fraction form
   31,025.61/42,840.23 = 21,577.77/x
3. Step 3: Cross multiply
   31,025.61x = 42,840.23 × 21,577.77
4. Step 4: Simplify right side
   31,025.61x = 924,396,521.80
5. Step 5: Solve for x
   x = 924,396,521.80/31,025.61
6. Step 6: Final answer
   x = 29,794.63