Finding the Fourth Proportional to 81,100.96, 111,971.98 and 72,588.34

Step by Step Solution

1. Step 1: Write the proportion equation
   81,100.96 : 111,971.98 = 72,588.34 : x
2. Step 2: Convert to fraction form
   81,100.96/111,971.98 = 72,588.34/x
3. Step 3: Cross multiply
   81,100.96x = 111,971.98 × 72,588.34
4. Step 4: Simplify right side
   81,100.96x = 8,127,860,154.71
5. Step 5: Solve for x
   x = 8,127,860,154.71/81,100.96
6. Step 6: Final answer
   x = 100,219.04