Finding the Fourth Proportional to 45,385.42, 68,081.38 and 12,105.30

Step by Step Solution

1. Step 1: Write the proportion equation
   45,385.42 : 68,081.38 = 12,105.30 : x
2. Step 2: Convert to fraction form
   45,385.42/68,081.38 = 12,105.30/x
3. Step 3: Cross multiply
   45,385.42x = 68,081.38 × 12,105.30
4. Step 4: Simplify right side
   45,385.42x = 824,145,529.31
5. Step 5: Solve for x
   x = 824,145,529.31/45,385.42
6. Step 6: Final answer
   x = 18,158.82