Finding the Fourth Proportional to 90,221.06, 135,242.34 and 42,752.78

Step by Step Solution

1. Step 1: Write the proportion equation
   90,221.06 : 135,242.34 = 42,752.78 : x
2. Step 2: Convert to fraction form
   90,221.06/135,242.34 = 42,752.78/x
3. Step 3: Cross multiply
   90,221.06x = 135,242.34 × 42,752.78
4. Step 4: Simplify right side
   90,221.06x = 5,781,986,008.71
5. Step 5: Solve for x
   x = 5,781,986,008.71/90,221.06
6. Step 6: Final answer
   x = 64,086.88