Finding the Fourth Proportional to 90,312.72, 135,475.56 and 31,147.53

Step by Step Solution

1. Step 1: Write the proportion equation
   90,312.72 : 135,475.56 = 31,147.53 : x
2. Step 2: Convert to fraction form
   90,312.72/135,475.56 = 31,147.53/x
3. Step 3: Cross multiply
   90,312.72x = 135,475.56 × 31,147.53
4. Step 4: Simplify right side
   90,312.72x = 4,219,729,069.37
5. Step 5: Solve for x
   x = 4,219,729,069.37/90,312.72
6. Step 6: Final answer
   x = 46,723.53