Finding the Fourth Proportional to 191,744.72, 287,714.32 and 129,284

Step by Step Solution

1. Step 1: Write the proportion equation
   191,744.72 : 287,714.32 = 129,284 : x
2. Step 2: Convert to fraction form
   191,744.72/287,714.32 = 129,284/x
3. Step 3: Cross multiply
   191,744.72x = 287,714.32 × 129,284
4. Step 4: Simplify right side
   191,744.72x = 37,196,858,146.88
5. Step 5: Solve for x
   x = 37,196,858,146.88/191,744.72
6. Step 6: Final answer
   x = 193,991.56