Finding the Fourth Proportional to 139,781.35, 209,356.57 and 64,743.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,781.35 : 209,356.57 = 64,743.86 : x
2. Step 2: Convert to fraction form
   139,781.35/209,356.57 = 64,743.86/x
3. Step 3: Cross multiply
   139,781.35x = 209,356.57 × 64,743.86
4. Step 4: Simplify right side
   139,781.35x = 13,554,552,066.94
5. Step 5: Solve for x
   x = 13,554,552,066.94/139,781.35
6. Step 6: Final answer
   x = 96,969.68