Finding the Fourth Proportional to 56,636.77, 78,160.74 and 31,145.08

Step by Step Solution

1. Step 1: Write the proportion equation
   56,636.77 : 78,160.74 = 31,145.08 : x
2. Step 2: Convert to fraction form
   56,636.77/78,160.74 = 31,145.08/x
3. Step 3: Cross multiply
   56,636.77x = 78,160.74 × 31,145.08
4. Step 4: Simplify right side
   56,636.77x = 2,434,322,109.36
5. Step 5: Solve for x
   x = 2,434,322,109.36/56,636.77
6. Step 6: Final answer
   x = 42,981.31