Finding the Fourth Proportional to 72,045.33, 107,980.45 and 50,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,045.33 : 107,980.45 = 50,991.50 : x
2. Step 2: Convert to fraction form
   72,045.33/107,980.45 = 50,991.50/x
3. Step 3: Cross multiply
   72,045.33x = 107,980.45 × 50,991.50
4. Step 4: Simplify right side
   72,045.33x = 5,506,084,448.79
5. Step 5: Solve for x
   x = 5,506,084,448.79/72,045.33
6. Step 6: Final answer
   x = 76,425.28