Finding the Fourth Proportional to 100,412.54, 138,570.71 and 55,089.69

Step by Step Solution

1. Step 1: Write the proportion equation
   100,412.54 : 138,570.71 = 55,089.69 : x
2. Step 2: Convert to fraction form
   100,412.54/138,570.71 = 55,089.69/x
3. Step 3: Cross multiply
   100,412.54x = 138,570.71 × 55,089.69
4. Step 4: Simplify right side
   100,412.54x = 7,633,818,218.43
5. Step 5: Solve for x
   x = 7,633,818,218.43/100,412.54
6. Step 6: Final answer
   x = 76,024.55