Finding the Fourth Proportional to 28,563.32, 42,862.72 and 13,773.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,563.32 : 42,862.72 = 13,773.76 : x
2. Step 2: Convert to fraction form
   28,563.32/42,862.72 = 13,773.76/x
3. Step 3: Cross multiply
   28,563.32x = 42,862.72 × 13,773.76
4. Step 4: Simplify right side
   28,563.32x = 590,380,818.23
5. Step 5: Solve for x
   x = 590,380,818.23/28,563.32
6. Step 6: Final answer
   x = 20,669.19