Finding the Fourth Proportional to 139,400.96, 209,206.59 and 64,573.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,400.96 : 209,206.59 = 64,573.60 : x
2. Step 2: Convert to fraction form
   139,400.96/209,206.59 = 64,573.60/x
3. Step 3: Cross multiply
   139,400.96x = 209,206.59 × 64,573.60
4. Step 4: Simplify right side
   139,400.96x = 13,509,222,660.02
5. Step 5: Solve for x
   x = 13,509,222,660.02/139,400.96
6. Step 6: Final answer
   x = 96,909.11