Finding the Fourth Proportional to 7,111.18, 10,666.80 and 3,412.54

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.18 : 10,666.80 = 3,412.54 : x
2. Step 2: Convert to fraction form
   7,111.18/10,666.80 = 3,412.54/x
3. Step 3: Cross multiply
   7,111.18x = 10,666.80 × 3,412.54
4. Step 4: Simplify right side
   7,111.18x = 36,400,881.67
5. Step 5: Solve for x
   x = 36,400,881.67/7,111.18
6. Step 6: Final answer
   x = 5,118.82