Finding the Fourth Proportional to 56,599.89, 78,109.36 and 31,106.99

Step by Step Solution

1. Step 1: Write the proportion equation
   56,599.89 : 78,109.36 = 31,106.99 : x
2. Step 2: Convert to fraction form
   56,599.89/78,109.36 = 31,106.99/x
3. Step 3: Cross multiply
   56,599.89x = 78,109.36 × 31,106.99
4. Step 4: Simplify right side
   56,599.89x = 2,429,747,080.43
5. Step 5: Solve for x
   x = 2,429,747,080.43/56,599.89
6. Step 6: Final answer
   x = 42,928.48