Finding the Fourth Proportional to 72,390.65, 108,090.82 and 64,845.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,390.65 : 108,090.82 = 64,845.50 : x
2. Step 2: Convert to fraction form
   72,390.65/108,090.82 = 64,845.50/x
3. Step 3: Cross multiply
   72,390.65x = 108,090.82 × 64,845.50
4. Step 4: Simplify right side
   72,390.65x = 7,009,202,808.91
5. Step 5: Solve for x
   x = 7,009,202,808.91/72,390.65
6. Step 6: Final answer
   x = 96,824.70