Finding the Fourth Proportional to 83,899.12, 125,870.48 and 31,309

Step by Step Solution

1. Step 1: Write the proportion equation
   83,899.12 : 125,870.48 = 31,309 : x
2. Step 2: Convert to fraction form
   83,899.12/125,870.48 = 31,309/x
3. Step 3: Cross multiply
   83,899.12x = 125,870.48 × 31,309
4. Step 4: Simplify right side
   83,899.12x = 3,940,878,858.32
5. Step 5: Solve for x
   x = 3,940,878,858.32/83,899.12
6. Step 6: Final answer
   x = 46,971.64