Finding the Fourth Proportional to 90,321.32, 135,528.24 and 42,989.96

Step by Step Solution

1. Step 1: Write the proportion equation
   90,321.32 : 135,528.24 = 42,989.96 : x
2. Step 2: Convert to fraction form
   90,321.32/135,528.24 = 42,989.96/x
3. Step 3: Cross multiply
   90,321.32x = 135,528.24 × 42,989.96
4. Step 4: Simplify right side
   90,321.32x = 5,826,353,616.47
5. Step 5: Solve for x
   x = 5,826,353,616.47/90,321.32
6. Step 6: Final answer
   x = 64,506.96