Finding the Fourth Proportional to 86,631.88, 129,870.06 and 31,189

Step by Step Solution

1. Step 1: Write the proportion equation
   86,631.88 : 129,870.06 = 31,189 : x
2. Step 2: Convert to fraction form
   86,631.88/129,870.06 = 31,189/x
3. Step 3: Cross multiply
   86,631.88x = 129,870.06 × 31,189
4. Step 4: Simplify right side
   86,631.88x = 4,050,517,301.34
5. Step 5: Solve for x
   x = 4,050,517,301.34/86,631.88
6. Step 6: Final answer
   x = 46,755.51