Finding the Fourth Proportional to 42,123.78, 63,200.25 and 28,139.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,123.78 : 63,200.25 = 28,139.94 : x
2. Step 2: Convert to fraction form
   42,123.78/63,200.25 = 28,139.94/x
3. Step 3: Cross multiply
   42,123.78x = 63,200.25 × 28,139.94
4. Step 4: Simplify right side
   42,123.78x = 1,778,451,242.99
5. Step 5: Solve for x
   x = 1,778,451,242.99/42,123.78
6. Step 6: Final answer
   x = 42,219.65