Finding the Fourth Proportional to 139,911.60, 209,753.04 and 65,078.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,911.60 : 209,753.04 = 65,078.40 : x
2. Step 2: Convert to fraction form
   139,911.60/209,753.04 = 65,078.40/x
3. Step 3: Cross multiply
   139,911.60x = 209,753.04 × 65,078.40
4. Step 4: Simplify right side
   139,911.60x = 13,650,392,238.34
5. Step 5: Solve for x
   x = 13,650,392,238.34/139,911.60
6. Step 6: Final answer
   x = 97,564.41