Finding the Fourth Proportional to 118,128.12, 163,015.62 and 64,413

Step by Step Solution

1. Step 1: Write the proportion equation
   118,128.12 : 163,015.62 = 64,413 : x
2. Step 2: Convert to fraction form
   118,128.12/163,015.62 = 64,413/x
3. Step 3: Cross multiply
   118,128.12x = 163,015.62 × 64,413
4. Step 4: Simplify right side
   118,128.12x = 10,500,325,131.06
5. Step 5: Solve for x
   x = 10,500,325,131.06/118,128.12
6. Step 6: Final answer
   x = 88,889.29