Finding the Fourth Proportional to 80,889.61, 111,594.78 and 53,678.53

Step by Step Solution

1. Step 1: Write the proportion equation
   80,889.61 : 111,594.78 = 53,678.53 : x
2. Step 2: Convert to fraction form
   80,889.61/111,594.78 = 53,678.53/x
3. Step 3: Cross multiply
   80,889.61x = 111,594.78 × 53,678.53
4. Step 4: Simplify right side
   80,889.61x = 5,990,243,746.07
5. Step 5: Solve for x
   x = 5,990,243,746.07/80,889.61
6. Step 6: Final answer
   x = 74,054.55