Finding the Fourth Proportional to 39,981.06, 55,109.16 and 30,389.04

Step by Step Solution

1. Step 1: Write the proportion equation
   39,981.06 : 55,109.16 = 30,389.04 : x
2. Step 2: Convert to fraction form
   39,981.06/55,109.16 = 30,389.04/x
3. Step 3: Cross multiply
   39,981.06x = 55,109.16 × 30,389.04
4. Step 4: Simplify right side
   39,981.06x = 1,674,714,467.61
5. Step 5: Solve for x
   x = 1,674,714,467.61/39,981.06
6. Step 6: Final answer
   x = 41,887.70