Finding the Fourth Proportional to 120,612.56, 180,924.52 and 99,513.50

Step by Step Solution

1. Step 1: Write the proportion equation
   120,612.56 : 180,924.52 = 99,513.50 : x
2. Step 2: Convert to fraction form
   120,612.56/180,924.52 = 99,513.50/x
3. Step 3: Cross multiply
   120,612.56x = 180,924.52 × 99,513.50
4. Step 4: Simplify right side
   120,612.56x = 18,004,432,221.02
5. Step 5: Solve for x
   x = 18,004,432,221.02/120,612.56
6. Step 6: Final answer
   x = 149,274.94