Finding the Fourth Proportional to 13,131.33, 19,701.01 and 7,872.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.33 : 19,701.01 = 7,872.20 : x
2. Step 2: Convert to fraction form
   13,131.33/19,701.01 = 7,872.20/x
3. Step 3: Cross multiply
   13,131.33x = 19,701.01 × 7,872.20
4. Step 4: Simplify right side
   13,131.33x = 155,090,172.74
5. Step 5: Solve for x
   x = 155,090,172.74/13,131.33
6. Step 6: Final answer
   x = 11,810.70