Finding the Fourth Proportional to 100,081.10, 138,109.08 and 54,758.10

Step by Step Solution

1. Step 1: Write the proportion equation
   100,081.10 : 138,109.08 = 54,758.10 : x
2. Step 2: Convert to fraction form
   100,081.10/138,109.08 = 54,758.10/x
3. Step 3: Cross multiply
   100,081.10x = 138,109.08 × 54,758.10
4. Step 4: Simplify right side
   100,081.10x = 7,562,590,813.55
5. Step 5: Solve for x
   x = 7,562,590,813.55/100,081.10
6. Step 6: Final answer
   x = 75,564.63