Finding the Fourth Proportional to 90,323.32, 135,531.24 and 42,991.96

Step by Step Solution

1. Step 1: Write the proportion equation
   90,323.32 : 135,531.24 = 42,991.96 : x
2. Step 2: Convert to fraction form
   90,323.32/135,531.24 = 42,991.96/x
3. Step 3: Cross multiply
   90,323.32x = 135,531.24 × 42,991.96
4. Step 4: Simplify right side
   90,323.32x = 5,826,753,648.83
5. Step 5: Solve for x
   x = 5,826,753,648.83/90,323.32
6. Step 6: Final answer
   x = 64,509.96