Finding the Fourth Proportional to 81,680.58, 112,719.21 and 45,870.62

Step by Step Solution

1. Step 1: Write the proportion equation
   81,680.58 : 112,719.21 = 45,870.62 : x
2. Step 2: Convert to fraction form
   81,680.58/112,719.21 = 45,870.62/x
3. Step 3: Cross multiply
   81,680.58x = 112,719.21 × 45,870.62
4. Step 4: Simplify right side
   81,680.58x = 5,170,499,485.01
5. Step 5: Solve for x
   x = 5,170,499,485.01/81,680.58
6. Step 6: Final answer
   x = 63,301.45