Finding the Fourth Proportional to 118,731, 163,848.78 and 65,739

Step by Step Solution

1. Step 1: Write the proportion equation
   118,731 : 163,848.78 = 65,739 : x
2. Step 2: Convert to fraction form
   118,731/163,848.78 = 65,739/x
3. Step 3: Cross multiply
   118,731x = 163,848.78 × 65,739
4. Step 4: Simplify right side
   118,731x = 10,771,254,948.42
5. Step 5: Solve for x
   x = 10,771,254,948.42/118,731
6. Step 6: Final answer
   x = 90,719.82