Finding the Fourth Proportional to 72,090.20, 99,484.62 and 40,259

Step by Step Solution

1. Step 1: Write the proportion equation
   72,090.20 : 99,484.62 = 40,259 : x
2. Step 2: Convert to fraction form
   72,090.20/99,484.62 = 40,259/x
3. Step 3: Cross multiply
   72,090.20x = 99,484.62 × 40,259
4. Step 4: Simplify right side
   72,090.20x = 4,005,151,316.58
5. Step 5: Solve for x
   x = 4,005,151,316.58/72,090.20
6. Step 6: Final answer
   x = 55,557.50