Finding the Fourth Proportional to 139,446.55, 209,081.13 and 64,466.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446.55 : 209,081.13 = 64,466.47 : x
2. Step 2: Convert to fraction form
   139,446.55/209,081.13 = 64,466.47/x
3. Step 3: Cross multiply
   139,446.55x = 209,081.13 × 64,466.47
4. Step 4: Simplify right side
   139,446.55x = 13,478,722,394.71
5. Step 5: Solve for x
   x = 13,478,722,394.71/139,446.55
6. Step 6: Final answer
   x = 96,658.70