Finding the Fourth Proportional to 65,780.72, 90,776.04 and 35,972.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,780.72 : 90,776.04 = 35,972.72 : x
2. Step 2: Convert to fraction form
   65,780.72/90,776.04 = 35,972.72/x
3. Step 3: Cross multiply
   65,780.72x = 90,776.04 × 35,972.72
4. Step 4: Simplify right side
   65,780.72x = 3,265,461,069.63
5. Step 5: Solve for x
   x = 3,265,461,069.63/65,780.72
6. Step 6: Final answer
   x = 49,641.61