Finding the Fourth Proportional to 15,385.89, 21,233.69 and 8,672.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,385.89 : 21,233.69 = 8,672.15 : x
2. Step 2: Convert to fraction form
   15,385.89/21,233.69 = 8,672.15/x
3. Step 3: Cross multiply
   15,385.89x = 21,233.69 × 8,672.15
4. Step 4: Simplify right side
   15,385.89x = 184,141,627.72
5. Step 5: Solve for x
   x = 184,141,627.72/15,385.89
6. Step 6: Final answer
   x = 11,968.22