Finding the Fourth Proportional to 72,980.06, 109,256.72 and 65,976.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,980.06 : 109,256.72 = 65,976.12 : x
2. Step 2: Convert to fraction form
   72,980.06/109,256.72 = 65,976.12/x
3. Step 3: Cross multiply
   72,980.06x = 109,256.72 × 65,976.12
4. Step 4: Simplify right side
   72,980.06x = 7,208,334,139.65
5. Step 5: Solve for x
   x = 7,208,334,139.65/72,980.06
6. Step 6: Final answer
   x = 98,771.29