Finding the Fourth Proportional to 118,131.60, 163,021.80 and 64,417.68

Step by Step Solution

1. Step 1: Write the proportion equation
   118,131.60 : 163,021.80 = 64,417.68 : x
2. Step 2: Convert to fraction form
   118,131.60/163,021.80 = 64,417.68/x
3. Step 3: Cross multiply
   118,131.60x = 163,021.80 × 64,417.68
4. Step 4: Simplify right side
   118,131.60x = 10,501,486,145.42
5. Step 5: Solve for x
   x = 10,501,486,145.42/118,131.60
6. Step 6: Final answer
   x = 88,896.50