Finding the Fourth Proportional to 72,155.40, 99,509.97 and 45,300.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72,155.40 : 99,509.97 = 45,300.42 : x
2. Step 2: Convert to fraction form
   72,155.40/99,509.97 = 45,300.42/x
3. Step 3: Cross multiply
   72,155.40x = 99,509.97 × 45,300.42
4. Step 4: Simplify right side
   72,155.40x = 4,507,843,435.19
5. Step 5: Solve for x
   x = 4,507,843,435.19/72,155.40
6. Step 6: Final answer
   x = 62,474.10