Finding the Fourth Proportional to 100,618.84, 138,806.15 and 72,340.93

Step by Step Solution

1. Step 1: Write the proportion equation
   100,618.84 : 138,806.15 = 72,340.93 : x
2. Step 2: Convert to fraction form
   100,618.84/138,806.15 = 72,340.93/x
3. Step 3: Cross multiply
   100,618.84x = 138,806.15 × 72,340.93
4. Step 4: Simplify right side
   100,618.84x = 10,041,365,980.72
5. Step 5: Solve for x
   x = 10,041,365,980.72/100,618.84
6. Step 6: Final answer
   x = 99,796.08