Finding the Fourth Proportional to 13,131.58, 19,720.86 and 12,603.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,131.58 : 19,720.86 = 12,603.06 : x
2. Step 2: Convert to fraction form
   13,131.58/19,720.86 = 12,603.06/x
3. Step 3: Cross multiply
   13,131.58x = 19,720.86 × 12,603.06
4. Step 4: Simplify right side
   13,131.58x = 248,543,181.83
5. Step 5: Solve for x
   x = 248,543,181.83/13,131.58
6. Step 6: Final answer
   x = 18,927.13