Finding the Fourth Proportional to 8,538.90, 11,784.04 and 5,181.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,538.90 : 11,784.04 = 5,181.72 : x
2. Step 2: Convert to fraction form
   8,538.90/11,784.04 = 5,181.72/x
3. Step 3: Cross multiply
   8,538.90x = 11,784.04 × 5,181.72
4. Step 4: Simplify right side
   8,538.90x = 61,061,595.75
5. Step 5: Solve for x
   x = 61,061,595.75/8,538.90
6. Step 6: Final answer
   x = 7,150.99