Finding the Fourth Proportional to 103,645.30, 155,237.55 and 89,821.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,645.30 : 155,237.55 = 89,821.30 : x
2. Step 2: Convert to fraction form
   103,645.30/155,237.55 = 89,821.30/x
3. Step 3: Cross multiply
   103,645.30x = 155,237.55 × 89,821.30
4. Step 4: Simplify right side
   103,645.30x = 13,943,638,549.82
5. Step 5: Solve for x
   x = 13,943,638,549.82/103,645.30
6. Step 6: Final answer
   x = 134,532.28