Finding the Fourth Proportional to 100,320.42, 138,443.73 and 55,002.74

Step by Step Solution

1. Step 1: Write the proportion equation
   100,320.42 : 138,443.73 = 55,002.74 : x
2. Step 2: Convert to fraction form
   100,320.42/138,443.73 = 55,002.74/x
3. Step 3: Cross multiply
   100,320.42x = 138,443.73 × 55,002.74
4. Step 4: Simplify right side
   100,320.42x = 7,614,784,485.82
5. Step 5: Solve for x
   x = 7,614,784,485.82/100,320.42
6. Step 6: Final answer
   x = 75,904.63