Finding the Fourth Proportional to 105,787, 158,686.98 and 31,915

Step by Step Solution

1. Step 1: Write the proportion equation
   105,787 : 158,686.98 = 31,915 : x
2. Step 2: Convert to fraction form
   105,787/158,686.98 = 31,915/x
3. Step 3: Cross multiply
   105,787x = 158,686.98 × 31,915
4. Step 4: Simplify right side
   105,787x = 5,064,494,966.70
5. Step 5: Solve for x
   x = 5,064,494,966.70/105,787
6. Step 6: Final answer
   x = 47,874.45