Finding the Fourth Proportional to 121,111.88, 181,667.88 and 57,917.07

Step by Step Solution

1. Step 1: Write the proportion equation
   121,111.88 : 181,667.88 = 57,917.07 : x
2. Step 2: Convert to fraction form
   121,111.88/181,667.88 = 57,917.07/x
3. Step 3: Cross multiply
   121,111.88x = 181,667.88 × 57,917.07
4. Step 4: Simplify right side
   121,111.88x = 10,521,671,322.71
5. Step 5: Solve for x
   x = 10,521,671,322.71/121,111.88
6. Step 6: Final answer
   x = 86,875.64