Finding the Fourth Proportional to 118,686.70, 163,791.52 and 64,971.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,686.70 : 163,791.52 = 64,971.72 : x
2. Step 2: Convert to fraction form
   118,686.70/163,791.52 = 64,971.72/x
3. Step 3: Cross multiply
   118,686.70x = 163,791.52 × 64,971.72
4. Step 4: Simplify right side
   118,686.70x = 10,641,816,613.39
5. Step 5: Solve for x
   x = 10,641,816,613.39/118,686.70
6. Step 6: Final answer
   x = 89,663.09