Finding the Fourth Proportional to 139,648.06, 209,308.02 and 64,609.66

Step by Step Solution

1. Step 1: Write the proportion equation
   139,648.06 : 209,308.02 = 64,609.66 : x
2. Step 2: Convert to fraction form
   139,648.06/209,308.02 = 64,609.66/x
3. Step 3: Cross multiply
   139,648.06x = 209,308.02 × 64,609.66
4. Step 4: Simplify right side
   139,648.06x = 13,523,320,026.82
5. Step 5: Solve for x
   x = 13,523,320,026.82/139,648.06
6. Step 6: Final answer
   x = 96,838.58