Finding the Fourth Proportional to 12,429.51, 17,150.88 and 7,123.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.51 : 17,150.88 = 7,123.47 : x
2. Step 2: Convert to fraction form
   12,429.51/17,150.88 = 7,123.47/x
3. Step 3: Cross multiply
   12,429.51x = 17,150.88 × 7,123.47
4. Step 4: Simplify right side
   12,429.51x = 122,173,779.15
5. Step 5: Solve for x
   x = 122,173,779.15/12,429.51
6. Step 6: Final answer
   x = 9,829.33