Finding the Fourth Proportional to 13,118.40, 18,100.45 and 7,812.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,118.40 : 18,100.45 = 7,812.18 : x
2. Step 2: Convert to fraction form
   13,118.40/18,100.45 = 7,812.18/x
3. Step 3: Cross multiply
   13,118.40x = 18,100.45 × 7,812.18
4. Step 4: Simplify right side
   13,118.40x = 141,403,973.48
5. Step 5: Solve for x
   x = 141,403,973.48/13,118.40
6. Step 6: Final answer
   x = 10,779.06