Finding the Fourth Proportional to 72,288.19, 99,853.01 and 55,499.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,288.19 : 99,853.01 = 55,499.86 : x
2. Step 2: Convert to fraction form
   72,288.19/99,853.01 = 55,499.86/x
3. Step 3: Cross multiply
   72,288.19x = 99,853.01 × 55,499.86
4. Step 4: Simplify right side
   72,288.19x = 5,541,828,075.58
5. Step 5: Solve for x
   x = 5,541,828,075.58/72,288.19
6. Step 6: Final answer
   x = 76,662.98