Finding the Fourth Proportional to 90,142.35, 135,235.67 and 30,978.87

Step by Step Solution

1. Step 1: Write the proportion equation
   90,142.35 : 135,235.67 = 30,978.87 : x
2. Step 2: Convert to fraction form
   90,142.35/135,235.67 = 30,978.87/x
3. Step 3: Cross multiply
   90,142.35x = 135,235.67 × 30,978.87
4. Step 4: Simplify right side
   90,142.35x = 4,189,448,240.29
5. Step 5: Solve for x
   x = 4,189,448,240.29/90,142.35
6. Step 6: Final answer
   x = 46,475.92