Finding the Fourth Proportional to 72,128.94, 99,536.10 and 40,298.08

Step by Step Solution

1. Step 1: Write the proportion equation
   72,128.94 : 99,536.10 = 40,298.08 : x
2. Step 2: Convert to fraction form
   72,128.94/99,536.10 = 40,298.08/x
3. Step 3: Cross multiply
   72,128.94x = 99,536.10 × 40,298.08
4. Step 4: Simplify right side
   72,128.94x = 4,011,113,223.01
5. Step 5: Solve for x
   x = 4,011,113,223.01/72,128.94
6. Step 6: Final answer
   x = 55,610.32