Finding the Fourth Proportional to 100,426.68, 138,588.72 and 55,104.92

Step by Step Solution

1. Step 1: Write the proportion equation
   100,426.68 : 138,588.72 = 55,104.92 : x
2. Step 2: Convert to fraction form
   100,426.68/138,588.72 = 55,104.92/x
3. Step 3: Cross multiply
   100,426.68x = 138,588.72 × 55,104.92
4. Step 4: Simplify right side
   100,426.68x = 7,636,920,328.50
5. Step 5: Solve for x
   x = 7,636,920,328.50/100,426.68
6. Step 6: Final answer
   x = 76,044.74