Finding the Fourth Proportional to 13,136.16, 19,699.56 and 4,368.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,136.16 : 19,699.56 = 4,368.72 : x
2. Step 2: Convert to fraction form
   13,136.16/19,699.56 = 4,368.72/x
3. Step 3: Cross multiply
   13,136.16x = 19,699.56 × 4,368.72
4. Step 4: Simplify right side
   13,136.16x = 86,061,861.76
5. Step 5: Solve for x
   x = 86,061,861.76/13,136.16
6. Step 6: Final answer
   x = 6,551.52