Finding the Fourth Proportional to 31,041.30, 42,812.96 and 20,953.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,041.30 : 42,812.96 = 20,953.76 : x
2. Step 2: Convert to fraction form
   31,041.30/42,812.96 = 20,953.76/x
3. Step 3: Cross multiply
   31,041.30x = 42,812.96 × 20,953.76
4. Step 4: Simplify right side
   31,041.30x = 897,092,488.73
5. Step 5: Solve for x
   x = 897,092,488.73/31,041.30
6. Step 6: Final answer
   x = 28,899.97