Finding the Fourth Proportional to 13,152.20, 19,731.94 and 7,312.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,152.20 : 19,731.94 = 7,312.91 : x
2. Step 2: Convert to fraction form
   13,152.20/19,731.94 = 7,312.91/x
3. Step 3: Cross multiply
   13,152.20x = 19,731.94 × 7,312.91
4. Step 4: Simplify right side
   13,152.20x = 144,297,784.40
5. Step 5: Solve for x
   x = 144,297,784.40/13,152.20
6. Step 6: Final answer
   x = 10,971.38