Finding the Fourth Proportional to 66,003.84, 91,088.64 and 42,111.36

Step by Step Solution

1. Step 1: Write the proportion equation
   66,003.84 : 91,088.64 = 42,111.36 : x
2. Step 2: Convert to fraction form
   66,003.84/91,088.64 = 42,111.36/x
3. Step 3: Cross multiply
   66,003.84x = 91,088.64 × 42,111.36
4. Step 4: Simplify right side
   66,003.84x = 3,835,866,510.95
5. Step 5: Solve for x
   x = 3,835,866,510.95/66,003.84
6. Step 6: Final answer
   x = 58,115.81