Finding the Fourth Proportional to 91,317.80, 136,912.08 and 31,317.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,317.80 : 136,912.08 = 31,317.50 : x
2. Step 2: Convert to fraction form
   91,317.80/136,912.08 = 31,317.50/x
3. Step 3: Cross multiply
   91,317.80x = 136,912.08 × 31,317.50
4. Step 4: Simplify right side
   91,317.80x = 4,287,744,065.40
5. Step 5: Solve for x
   x = 4,287,744,065.40/91,317.80
6. Step 6: Final answer
   x = 46,954.09