Finding the Fourth Proportional to 31,055.19, 42,816.76 and 20,976.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,055.19 : 42,816.76 = 20,976.76 : x
2. Step 2: Convert to fraction form
   31,055.19/42,816.76 = 20,976.76/x
3. Step 3: Cross multiply
   31,055.19x = 42,816.76 × 20,976.76
4. Step 4: Simplify right side
   31,055.19x = 898,156,898.50
5. Step 5: Solve for x
   x = 898,156,898.50/31,055.19
6. Step 6: Final answer
   x = 28,921.31