Finding the Fourth Proportional to 76,465, 105,521.70 and 42,931.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,465 : 105,521.70 = 42,931.72 : x
2. Step 2: Convert to fraction form
   76,465/105,521.70 = 42,931.72/x
3. Step 3: Cross multiply
   76,465x = 105,521.70 × 42,931.72
4. Step 4: Simplify right side
   76,465x = 4,530,228,078.32
5. Step 5: Solve for x
   x = 4,530,228,078.32/76,465
6. Step 6: Final answer
   x = 59,245.77