Finding the Fourth Proportional to 118,128.30, 163,011.06 and 64,412.88

Step by Step Solution

1. Step 1: Write the proportion equation
   118,128.30 : 163,011.06 = 64,412.88 : x
2. Step 2: Convert to fraction form
   118,128.30/163,011.06 = 64,412.88/x
3. Step 3: Cross multiply
   118,128.30x = 163,011.06 × 64,412.88
4. Step 4: Simplify right side
   118,128.30x = 10,500,011,846.45
5. Step 5: Solve for x
   x = 10,500,011,846.45/118,128.30
6. Step 6: Final answer
   x = 88,886.51