Finding the Fourth Proportional to 13,312.72, 19,966.52 and 4,546.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,312.72 : 19,966.52 = 4,546.72 : x
2. Step 2: Convert to fraction form
   13,312.72/19,966.52 = 4,546.72/x
3. Step 3: Cross multiply
   13,312.72x = 19,966.52 × 4,546.72
4. Step 4: Simplify right side
   13,312.72x = 90,782,175.81
5. Step 5: Solve for x
   x = 90,782,175.81/13,312.72
6. Step 6: Final answer
   x = 6,819.21