Finding the Fourth Proportional to 72,116.21, 99,519.90 and 40,284.83

Step by Step Solution

1. Step 1: Write the proportion equation
   72,116.21 : 99,519.90 = 40,284.83 : x
2. Step 2: Convert to fraction form
   72,116.21/99,519.90 = 40,284.83/x
3. Step 3: Cross multiply
   72,116.21x = 99,519.90 × 40,284.83
4. Step 4: Simplify right side
   72,116.21x = 4,009,142,253.12
5. Step 5: Solve for x
   x = 4,009,142,253.12/72,116.21
6. Step 6: Final answer
   x = 55,592.80