Finding the Fourth Proportional to 5,118.74, 7,061.56 and 3,128.93

Step by Step Solution

1. Step 1: Write the proportion equation
   5,118.74 : 7,061.56 = 3,128.93 : x
2. Step 2: Convert to fraction form
   5,118.74/7,061.56 = 3,128.93/x
3. Step 3: Cross multiply
   5,118.74x = 7,061.56 × 3,128.93
4. Step 4: Simplify right side
   5,118.74x = 22,095,110.28
5. Step 5: Solve for x
   x = 22,095,110.28/5,118.74
6. Step 6: Final answer
   x = 4,316.51