Finding the Fourth Proportional to 12,935.80, 19,405.86 and 4,613.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,935.80 : 19,405.86 = 4,613.86 : x
2. Step 2: Convert to fraction form
   12,935.80/19,405.86 = 4,613.86/x
3. Step 3: Cross multiply
   12,935.80x = 19,405.86 × 4,613.86
4. Step 4: Simplify right side
   12,935.80x = 89,535,921.22
5. Step 5: Solve for x
   x = 89,535,921.22/12,935.80
6. Step 6: Final answer
   x = 6,921.56