Finding the Fourth Proportional to 138,738.42, 208,114.83 and 43,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   138,738.42 : 208,114.83 = 43,978.68 : x
2. Step 2: Convert to fraction form
   138,738.42/208,114.83 = 43,978.68/x
3. Step 3: Cross multiply
   138,738.42x = 208,114.83 × 43,978.68
4. Step 4: Simplify right side
   138,738.42x = 9,152,615,511.82
5. Step 5: Solve for x
   x = 9,152,615,511.82/138,738.42
6. Step 6: Final answer
   x = 65,970.30