Finding the Fourth Proportional to 110,111.85, 151,978.55 and 72,389.61

Step by Step Solution

1. Step 1: Write the proportion equation
   110,111.85 : 151,978.55 = 72,389.61 : x
2. Step 2: Convert to fraction form
   110,111.85/151,978.55 = 72,389.61/x
3. Step 3: Cross multiply
   110,111.85x = 151,978.55 × 72,389.61
4. Step 4: Simplify right side
   110,111.85x = 11,001,667,600.92
5. Step 5: Solve for x
   x = 11,001,667,600.92/110,111.85
6. Step 6: Final answer
   x = 99,913.57