Finding the Fourth Proportional to 90,144.10, 135,238.29 and 30,980.62

Step by Step Solution

1. Step 1: Write the proportion equation
   90,144.10 : 135,238.29 = 30,980.62 : x
2. Step 2: Convert to fraction form
   90,144.10/135,238.29 = 30,980.62/x
3. Step 3: Cross multiply
   90,144.10x = 135,238.29 × 30,980.62
4. Step 4: Simplify right side
   90,144.10x = 4,189,766,071.94
5. Step 5: Solve for x
   x = 4,189,766,071.94/90,144.10
6. Step 6: Final answer
   x = 46,478.54