Finding the Fourth Proportional to 72,139.04, 99,545.40 and 40,303.52

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139.04 : 99,545.40 = 40,303.52 : x
2. Step 2: Convert to fraction form
   72,139.04/99,545.40 = 40,303.52/x
3. Step 3: Cross multiply
   72,139.04x = 99,545.40 × 40,303.52
4. Step 4: Simplify right side
   72,139.04x = 4,012,030,019.81
5. Step 5: Solve for x
   x = 4,012,030,019.81/72,139.04
6. Step 6: Final answer
   x = 55,615.24