Finding the Fourth Proportional to 99,603.56, 137,448.89 and 54,280.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99,603.56 : 137,448.89 = 54,280.56 : x
2. Step 2: Convert to fraction form
   99,603.56/137,448.89 = 54,280.56/x
3. Step 3: Cross multiply
   99,603.56x = 137,448.89 × 54,280.56
4. Step 4: Simplify right side
   99,603.56x = 7,460,803,371.71
5. Step 5: Solve for x
   x = 7,460,803,371.71/99,603.56
6. Step 6: Final answer
   x = 74,904.99