Finding the Fourth Proportional to 128,521,103.83, 177,357,307.38 and 72,765,085.54

Step by Step Solution

1. Step 1: Write the proportion equation
   128,521,103.83 : 177,357,307.38 = 72,765,085.54 : x
2. Step 2: Convert to fraction form
   128,521,103.83/177,357,307.38 = 72,765,085.54/x
3. Step 3: Cross multiply
   128,521,103.83x = 177,357,307.38 × 72,765,085.54
4. Step 4: Simplify right side
   128,521,103.83x = 12,905,419,642,649,774
5. Step 5: Solve for x
   x = 12,905,419,642,649,774/128,521,103.83
6. Step 6: Final answer
   x = 100,414,789.93