Finding the Fourth Proportional to 118,434.81, 163,442.17 and 64,722.09

Step by Step Solution

1. Step 1: Write the proportion equation
   118,434.81 : 163,442.17 = 64,722.09 : x
2. Step 2: Convert to fraction form
   118,434.81/163,442.17 = 64,722.09/x
3. Step 3: Cross multiply
   118,434.81x = 163,442.17 × 64,722.09
4. Step 4: Simplify right side
   118,434.81x = 10,578,318,836.54
5. Step 5: Solve for x
   x = 10,578,318,836.54/118,434.81
6. Step 6: Final answer
   x = 89,317.65