Finding the Fourth Proportional to 78,596.88, 118,424.89 and 64,864.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,596.88 : 118,424.89 = 64,864.50 : x
2. Step 2: Convert to fraction form
   78,596.88/118,424.89 = 64,864.50/x
3. Step 3: Cross multiply
   78,596.88x = 118,424.89 × 64,864.50
4. Step 4: Simplify right side
   78,596.88x = 7,681,570,549.53
5. Step 5: Solve for x
   x = 7,681,570,549.53/78,596.88
6. Step 6: Final answer
   x = 97,733.78