Finding the Fourth Proportional to 10,152.79, 15,188.18 and 8,781.37

Step by Step Solution

1. Step 1: Write the proportion equation
   10,152.79 : 15,188.18 = 8,781.37 : x
2. Step 2: Convert to fraction form
   10,152.79/15,188.18 = 8,781.37/x
3. Step 3: Cross multiply
   10,152.79x = 15,188.18 × 8,781.37
4. Step 4: Simplify right side
   10,152.79x = 133,372,946.33
5. Step 5: Solve for x
   x = 133,372,946.33/10,152.79
6. Step 6: Final answer
   x = 13,136.58