Finding the Fourth Proportional to 28,101.72, 42,152.56 and 9,130.16

Step by Step Solution

1. Step 1: Write the proportion equation
   28,101.72 : 42,152.56 = 9,130.16 : x
2. Step 2: Convert to fraction form
   28,101.72/42,152.56 = 9,130.16/x
3. Step 3: Cross multiply
   28,101.72x = 42,152.56 × 9,130.16
4. Step 4: Simplify right side
   28,101.72x = 384,859,617.21
5. Step 5: Solve for x
   x = 384,859,617.21/28,101.72
6. Step 6: Final answer
   x = 13,695.23