Finding the Fourth Proportional to 13,610.01, 18,780.52 and 7,640.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,610.01 : 18,780.52 = 7,640.31 : x
2. Step 2: Convert to fraction form
   13,610.01/18,780.52 = 7,640.31/x
3. Step 3: Cross multiply
   13,610.01x = 18,780.52 × 7,640.31
4. Step 4: Simplify right side
   13,610.01x = 143,488,994.76
5. Step 5: Solve for x
   x = 143,488,994.76/13,610.01
6. Step 6: Final answer
   x = 10,542.90