Finding the Fourth Proportional to 35,155.91, 52,731.15 and 12,965.15

Step by Step Solution

1. Step 1: Write the proportion equation
   35,155.91 : 52,731.15 = 12,965.15 : x
2. Step 2: Convert to fraction form
   35,155.91/52,731.15 = 12,965.15/x
3. Step 3: Cross multiply
   35,155.91x = 52,731.15 × 12,965.15
4. Step 4: Simplify right side
   35,155.91x = 683,667,005.77
5. Step 5: Solve for x
   x = 683,667,005.77/35,155.91
6. Step 6: Final answer
   x = 19,446.72