Finding the Fourth Proportional to 28,005.52, 42,012.42 and 9,023.79

Step by Step Solution

1. Step 1: Write the proportion equation
   28,005.52 : 42,012.42 = 9,023.79 : x
2. Step 2: Convert to fraction form
   28,005.52/42,012.42 = 9,023.79/x
3. Step 3: Cross multiply
   28,005.52x = 42,012.42 × 9,023.79
4. Step 4: Simplify right side
   28,005.52x = 379,111,272.39
5. Step 5: Solve for x
   x = 379,111,272.39/28,005.52
6. Step 6: Final answer
   x = 13,537.02