Finding the Fourth Proportional to 72,003.30, 107,859.15 and 40,802.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,003.30 : 107,859.15 = 40,802.10 : x
2. Step 2: Convert to fraction form
   72,003.30/107,859.15 = 40,802.10/x
3. Step 3: Cross multiply
   72,003.30x = 107,859.15 × 40,802.10
4. Step 4: Simplify right side
   72,003.30x = 4,400,879,824.22
5. Step 5: Solve for x
   x = 4,400,879,824.22/72,003.30
6. Step 6: Final answer
   x = 61,120.53