Finding the Fourth Proportional to 191,911.72, 287,871.18 and 65,580.88

Step by Step Solution

1. Step 1: Write the proportion equation
   191,911.72 : 287,871.18 = 65,580.88 : x
2. Step 2: Convert to fraction form
   191,911.72/287,871.18 = 65,580.88/x
3. Step 3: Cross multiply
   191,911.72x = 287,871.18 × 65,580.88
4. Step 4: Simplify right side
   191,911.72x = 18,878,845,311.04
5. Step 5: Solve for x
   x = 18,878,845,311.04/191,911.72
6. Step 6: Final answer
   x = 98,372.55