Finding the Fourth Proportional to 10,091.89, 15,128.61 and 4,248.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,091.89 : 15,128.61 = 4,248.91 : x
2. Step 2: Convert to fraction form
   10,091.89/15,128.61 = 4,248.91/x
3. Step 3: Cross multiply
   10,091.89x = 15,128.61 × 4,248.91
4. Step 4: Simplify right side
   10,091.89x = 64,280,102.32
5. Step 5: Solve for x
   x = 64,280,102.32/10,091.89
6. Step 6: Final answer
   x = 6,369.48