Finding the Fourth Proportional to 76,434, 105,479.64 and 42,900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,434 : 105,479.64 = 42,900.72 : x
2. Step 2: Convert to fraction form
   76,434/105,479.64 = 42,900.72/x
3. Step 3: Cross multiply
   76,434x = 105,479.64 × 42,900.72
4. Step 4: Simplify right side
   76,434x = 4,525,152,501.34
5. Step 5: Solve for x
   x = 4,525,152,501.34/76,434
6. Step 6: Final answer
   x = 59,203.40