Finding the Fourth Proportional to 98,144.37, 135,429.12 and 55,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   98,144.37 : 135,429.12 = 55,128.69 : x
2. Step 2: Convert to fraction form
   98,144.37/135,429.12 = 55,128.69/x
3. Step 3: Cross multiply
   98,144.37x = 135,429.12 × 55,128.69
4. Step 4: Simplify right side
   98,144.37x = 7,466,029,973.45
5. Step 5: Solve for x
   x = 7,466,029,973.45/98,144.37
6. Step 6: Final answer
   x = 76,071.91