Finding the Fourth Proportional to 13,971.60, 19,279.32 and 8,002.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,971.60 : 19,279.32 = 8,002.72 : x
2. Step 2: Convert to fraction form
   13,971.60/19,279.32 = 8,002.72/x
3. Step 3: Cross multiply
   13,971.60x = 19,279.32 × 8,002.72
4. Step 4: Simplify right side
   13,971.60x = 154,286,999.75
5. Step 5: Solve for x
   x = 154,286,999.75/13,971.60
6. Step 6: Final answer
   x = 11,042.90