Finding the Fourth Proportional to 139,256.99, 208,851.89 and 64,305.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,256.99 : 208,851.89 = 64,305.09 : x
2. Step 2: Convert to fraction form
   139,256.99/208,851.89 = 64,305.09/x
3. Step 3: Cross multiply
   139,256.99x = 208,851.89 × 64,305.09
4. Step 4: Simplify right side
   139,256.99x = 13,430,239,261.59
5. Step 5: Solve for x
   x = 13,430,239,261.59/139,256.99
6. Step 6: Final answer
   x = 96,442.12