Finding the Fourth Proportional to 72,123.80, 99,532.56 and 39,858.44

Step by Step Solution

1. Step 1: Write the proportion equation
   72,123.80 : 99,532.56 = 39,858.44 : x
2. Step 2: Convert to fraction form
   72,123.80/99,532.56 = 39,858.44/x
3. Step 3: Cross multiply
   72,123.80x = 99,532.56 × 39,858.44
4. Step 4: Simplify right side
   72,123.80x = 3,967,212,570.81
5. Step 5: Solve for x
   x = 3,967,212,570.81/72,123.80
6. Step 6: Final answer
   x = 55,005.60