Finding the Fourth Proportional to 139,490, 209,327.16 and 65,623.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,490 : 209,327.16 = 65,623.76 : x
2. Step 2: Convert to fraction form
   139,490/209,327.16 = 65,623.76/x
3. Step 3: Cross multiply
   139,490x = 209,327.16 × 65,623.76
4. Step 4: Simplify right side
   139,490x = 13,736,835,309.32
5. Step 5: Solve for x
   x = 13,736,835,309.32/139,490
6. Step 6: Final answer
   x = 98,479.00