Finding the Fourth Proportional to 81,986.71, 113,145.16 and 45,688.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,986.71 : 113,145.16 = 45,688.20 : x
2. Step 2: Convert to fraction form
   81,986.71/113,145.16 = 45,688.20/x
3. Step 3: Cross multiply
   81,986.71x = 113,145.16 × 45,688.20
4. Step 4: Simplify right side
   81,986.71x = 5,169,398,019.17
5. Step 5: Solve for x
   x = 5,169,398,019.17/81,986.71
6. Step 6: Final answer
   x = 63,051.66