Finding the Fourth Proportional to 139,596.76, 209,418.66 and 64,686.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,596.76 : 209,418.66 = 64,686.52 : x
2. Step 2: Convert to fraction form
   139,596.76/209,418.66 = 64,686.52/x
3. Step 3: Cross multiply
   139,596.76x = 209,418.66 × 64,686.52
4. Step 4: Simplify right side
   139,596.76x = 13,546,564,338.46
5. Step 5: Solve for x
   x = 13,546,564,338.46/139,596.76
6. Step 6: Final answer
   x = 97,040.68