Finding the Fourth Proportional to 8,913.61, 12,300.50 and 5,136.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,913.61 : 12,300.50 = 5,136.79 : x
2. Step 2: Convert to fraction form
   8,913.61/12,300.50 = 5,136.79/x
3. Step 3: Cross multiply
   8,913.61x = 12,300.50 × 5,136.79
4. Step 4: Simplify right side
   8,913.61x = 63,185,085.40
5. Step 5: Solve for x
   x = 63,185,085.40/8,913.61
6. Step 6: Final answer
   x = 7,088.61