Finding the Fourth Proportional to 10,985.79, 15,144.60 and 7,836.51

Step by Step Solution

1. Step 1: Write the proportion equation
   10,985.79 : 15,144.60 = 7,836.51 : x
2. Step 2: Convert to fraction form
   10,985.79/15,144.60 = 7,836.51/x
3. Step 3: Cross multiply
   10,985.79x = 15,144.60 × 7,836.51
4. Step 4: Simplify right side
   10,985.79x = 118,680,809.35
5. Step 5: Solve for x
   x = 118,680,809.35/10,985.79
6. Step 6: Final answer
   x = 10,803.12