Finding the Fourth Proportional to 139,488, 209,324.16 and 65,621.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,488 : 209,324.16 = 65,621.76 : x
2. Step 2: Convert to fraction form
   139,488/209,324.16 = 65,621.76/x
3. Step 3: Cross multiply
   139,488x = 209,324.16 × 65,621.76
4. Step 4: Simplify right side
   139,488x = 13,736,219,789.72
5. Step 5: Solve for x
   x = 13,736,219,789.72/139,488
6. Step 6: Final answer
   x = 98,476.00