Finding the Fourth Proportional to 139,124.16, 208,661.99 and 64,237.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,124.16 : 208,661.99 = 64,237.91 : x
2. Step 2: Convert to fraction form
   139,124.16/208,661.99 = 64,237.91/x
3. Step 3: Cross multiply
   139,124.16x = 208,661.99 × 64,237.91
4. Step 4: Simplify right side
   139,124.16x = 13,404,008,769.54
5. Step 5: Solve for x
   x = 13,404,008,769.54/139,124.16
6. Step 6: Final answer
   x = 96,345.66