Finding the Fourth Proportional to 89,486.40, 123,436.80 and 64,369.92

Step by Step Solution

1. Step 1: Write the proportion equation
   89,486.40 : 123,436.80 = 64,369.92 : x
2. Step 2: Convert to fraction form
   89,486.40/123,436.80 = 64,369.92/x
3. Step 3: Cross multiply
   89,486.40x = 123,436.80 × 64,369.92
4. Step 4: Simplify right side
   89,486.40x = 7,945,616,941.06
5. Step 5: Solve for x
   x = 7,945,616,941.06/89,486.40
6. Step 6: Final answer
   x = 88,791.34