Finding the Fourth Proportional to 90,243.06, 135,275.34 and 42,774.80

Step by Step Solution

1. Step 1: Write the proportion equation
   90,243.06 : 135,275.34 = 42,774.80 : x
2. Step 2: Convert to fraction form
   90,243.06/135,275.34 = 42,774.80/x
3. Step 3: Cross multiply
   90,243.06x = 135,275.34 × 42,774.80
4. Step 4: Simplify right side
   90,243.06x = 5,786,375,613.43
5. Step 5: Solve for x
   x = 5,786,375,613.43/90,243.06
6. Step 6: Final answer
   x = 64,119.90