Finding the Fourth Proportional to 56,111.16, 84,137.16 and 18,667.28

Step by Step Solution

1. Step 1: Write the proportion equation
   56,111.16 : 84,137.16 = 18,667.28 : x
2. Step 2: Convert to fraction form
   56,111.16/84,137.16 = 18,667.28/x
3. Step 3: Cross multiply
   56,111.16x = 84,137.16 × 18,667.28
4. Step 4: Simplify right side
   56,111.16x = 1,570,611,924.12
5. Step 5: Solve for x
   x = 1,570,611,924.12/56,111.16
6. Step 6: Final answer
   x = 27,991.08