Finding the Fourth Proportional to 81,200.72, 112,056.66 and 45,390.71

Step by Step Solution

1. Step 1: Write the proportion equation
   81,200.72 : 112,056.66 = 45,390.71 : x
2. Step 2: Convert to fraction form
   81,200.72/112,056.66 = 45,390.71/x
3. Step 3: Cross multiply
   81,200.72x = 112,056.66 × 45,390.71
4. Step 4: Simplify right side
   81,200.72x = 5,086,330,797.35
5. Step 5: Solve for x
   x = 5,086,330,797.35/81,200.72
6. Step 6: Final answer
   x = 62,638.99