Finding the Fourth Proportional to 100,090.89, 138,124.71 and 54,768.02

Step by Step Solution

1. Step 1: Write the proportion equation
   100,090.89 : 138,124.71 = 54,768.02 : x
2. Step 2: Convert to fraction form
   100,090.89/138,124.71 = 54,768.02/x
3. Step 3: Cross multiply
   100,090.89x = 138,124.71 × 54,768.02
4. Step 4: Simplify right side
   100,090.89x = 7,564,816,189.15
5. Step 5: Solve for x
   x = 7,564,816,189.15/100,090.89
6. Step 6: Final answer
   x = 75,579.47