Finding the Fourth Proportional to 13,345.32, 18,412.50 and 9,312.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,345.32 : 18,412.50 = 9,312.04 : x
2. Step 2: Convert to fraction form
   13,345.32/18,412.50 = 9,312.04/x
3. Step 3: Cross multiply
   13,345.32x = 18,412.50 × 9,312.04
4. Step 4: Simplify right side
   13,345.32x = 171,457,936.50
5. Step 5: Solve for x
   x = 171,457,936.50/13,345.32
6. Step 6: Final answer
   x = 12,847.80