Finding the Fourth Proportional to 90,223.90, 135,263.76 and 42,815.14

Step by Step Solution

1. Step 1: Write the proportion equation
   90,223.90 : 135,263.76 = 42,815.14 : x
2. Step 2: Convert to fraction form
   90,223.90/135,263.76 = 42,815.14/x
3. Step 3: Cross multiply
   90,223.90x = 135,263.76 × 42,815.14
4. Step 4: Simplify right side
   90,223.90x = 5,791,336,821.33
5. Step 5: Solve for x
   x = 5,791,336,821.33/90,223.90
6. Step 6: Final answer
   x = 64,188.50