Finding the Fourth Proportional to 72,390.80, 98,077.50 and 72,390.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,390.80 : 98,077.50 = 72,390.80 : x
2. Step 2: Convert to fraction form
   72,390.80/98,077.50 = 72,390.80/x
3. Step 3: Cross multiply
   72,390.80x = 98,077.50 × 72,390.80
4. Step 4: Simplify right side
   72,390.80x = 7,099,908,687
5. Step 5: Solve for x
   x = 7,099,908,687/72,390.80
6. Step 6: Final answer
   x = 98,077.50