Finding the Fourth Proportional to 35,780.15, 53,694.83 and 12,406.59

Step by Step Solution

1. Step 1: Write the proportion equation
   35,780.15 : 53,694.83 = 12,406.59 : x
2. Step 2: Convert to fraction form
   35,780.15/53,694.83 = 12,406.59/x
3. Step 3: Cross multiply
   35,780.15x = 53,694.83 × 12,406.59
4. Step 4: Simplify right side
   35,780.15x = 666,169,740.93
5. Step 5: Solve for x
   x = 666,169,740.93/35,780.15
6. Step 6: Final answer
   x = 18,618.42