Finding the Fourth Proportional to 8,973.48, 13,461.42 and 3,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   8,973.48 : 13,461.42 = 3,128.70 : x
2. Step 2: Convert to fraction form
   8,973.48/13,461.42 = 3,128.70/x
3. Step 3: Cross multiply
   8,973.48x = 13,461.42 × 3,128.70
4. Step 4: Simplify right side
   8,973.48x = 42,116,744.75
5. Step 5: Solve for x
   x = 42,116,744.75/8,973.48
6. Step 6: Final answer
   x = 4,693.47