Finding the Fourth Proportional to 98,820.72, 136,371.24 and 54,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   98,820.72 : 136,371.24 = 54,108.72 : x
2. Step 2: Convert to fraction form
   98,820.72/136,371.24 = 54,108.72/x
3. Step 3: Cross multiply
   98,820.72x = 136,371.24 × 54,108.72
4. Step 4: Simplify right side
   98,820.72x = 7,378,873,241.21
5. Step 5: Solve for x
   x = 7,378,873,241.21/98,820.72
6. Step 6: Final answer
   x = 74,669.29