Finding the Fourth Proportional to 91,569.69, 126,376.61 and 55,780.65

Step by Step Solution

1. Step 1: Write the proportion equation
   91,569.69 : 126,376.61 = 55,780.65 : x
2. Step 2: Convert to fraction form
   91,569.69/126,376.61 = 55,780.65/x
3. Step 3: Cross multiply
   91,569.69x = 126,376.61 × 55,780.65
4. Step 4: Simplify right side
   91,569.69x = 7,049,369,171.69
5. Step 5: Solve for x
   x = 7,049,369,171.69/91,569.69
6. Step 6: Final answer
   x = 76,983.65