Finding the Fourth Proportional to 9,780.51, 13,499.04 and 5,531.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,780.51 : 13,499.04 = 5,531.58 : x
2. Step 2: Convert to fraction form
   9,780.51/13,499.04 = 5,531.58/x
3. Step 3: Cross multiply
   9,780.51x = 13,499.04 × 5,531.58
4. Step 4: Simplify right side
   9,780.51x = 74,671,019.68
5. Step 5: Solve for x
   x = 74,671,019.68/9,780.51
6. Step 6: Final answer
   x = 7,634.68