Finding the Fourth Proportional to 112,365.48, 155,061.64 and 64,617.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,365.48 : 155,061.64 = 64,617.78 : x
2. Step 2: Convert to fraction form
   112,365.48/155,061.64 = 64,617.78/x
3. Step 3: Cross multiply
   112,365.48x = 155,061.64 × 64,617.78
4. Step 4: Simplify right side
   112,365.48x = 10,019,738,939.96
5. Step 5: Solve for x
   x = 10,019,738,939.96/112,365.48
6. Step 6: Final answer
   x = 89,170.97