Finding the Fourth Proportional to 90,389.10, 135,407.17 and 42,936.67

Step by Step Solution

1. Step 1: Write the proportion equation
   90,389.10 : 135,407.17 = 42,936.67 : x
2. Step 2: Convert to fraction form
   90,389.10/135,407.17 = 42,936.67/x
3. Step 3: Cross multiply
   90,389.10x = 135,407.17 × 42,936.67
4. Step 4: Simplify right side
   90,389.10x = 5,813,932,973.92
5. Step 5: Solve for x
   x = 5,813,932,973.92/90,389.10
6. Step 6: Final answer
   x = 64,321.17