Finding the Fourth Proportional to 89,499.65, 123,478.78 and 55,495.90

Step by Step Solution

1. Step 1: Write the proportion equation
   89,499.65 : 123,478.78 = 55,495.90 : x
2. Step 2: Convert to fraction form
   89,499.65/123,478.78 = 55,495.90/x
3. Step 3: Cross multiply
   89,499.65x = 123,478.78 × 55,495.90
4. Step 4: Simplify right side
   89,499.65x = 6,852,566,027.00
5. Step 5: Solve for x
   x = 6,852,566,027.00/89,499.65
6. Step 6: Final answer
   x = 76,565.28