Finding the Fourth Proportional to 12,692.88, 19,047.56 and 5,677.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,692.88 : 19,047.56 = 5,677.20 : x
2. Step 2: Convert to fraction form
   12,692.88/19,047.56 = 5,677.20/x
3. Step 3: Cross multiply
   12,692.88x = 19,047.56 × 5,677.20
4. Step 4: Simplify right side
   12,692.88x = 108,136,779.25
5. Step 5: Solve for x
   x = 108,136,779.25/12,692.88
6. Step 6: Final answer
   x = 8,519.48