Finding the Fourth Proportional to 90,870.80, 136,296.47 and 31,707.59

Step by Step Solution

1. Step 1: Write the proportion equation
   90,870.80 : 136,296.47 = 31,707.59 : x
2. Step 2: Convert to fraction form
   90,870.80/136,296.47 = 31,707.59/x
3. Step 3: Cross multiply
   90,870.80x = 136,296.47 × 31,707.59
4. Step 4: Simplify right side
   90,870.80x = 4,321,631,986.99
5. Step 5: Solve for x
   x = 4,321,631,986.99/90,870.80
6. Step 6: Final answer
   x = 47,557.99