Finding the Fourth Proportional to 153,714, 212,128.56 and 86,646

Step by Step Solution

1. Step 1: Write the proportion equation
   153,714 : 212,128.56 = 86,646 : x
2. Step 2: Convert to fraction form
   153,714/212,128.56 = 86,646/x
3. Step 3: Cross multiply
   153,714x = 212,128.56 × 86,646
4. Step 4: Simplify right side
   153,714x = 18,380,091,209.76
5. Step 5: Solve for x
   x = 18,380,091,209.76/153,714
6. Step 6: Final answer
   x = 119,573.31