Finding the Fourth Proportional to 139,392.71, 209,057.54 and 64,471.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,392.71 : 209,057.54 = 64,471.74 : x
2. Step 2: Convert to fraction form
   139,392.71/209,057.54 = 64,471.74/x
3. Step 3: Cross multiply
   139,392.71x = 209,057.54 × 64,471.74
4. Step 4: Simplify right side
   139,392.71x = 13,478,303,041.56
5. Step 5: Solve for x
   x = 13,478,303,041.56/139,392.71
6. Step 6: Final answer
   x = 96,693.03