Finding the Fourth Proportional to 56,123.28, 84,199.52 and 28,042.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,123.28 : 84,199.52 = 28,042.20 : x
2. Step 2: Convert to fraction form
   56,123.28/84,199.52 = 28,042.20/x
3. Step 3: Cross multiply
   56,123.28x = 84,199.52 × 28,042.20
4. Step 4: Simplify right side
   56,123.28x = 2,361,139,639.53
5. Step 5: Solve for x
   x = 2,361,139,639.53/56,123.28
6. Step 6: Final answer
   x = 42,070.59