Finding the Fourth Proportional to 76,111.07, 105,030.69 and 42,120.99

Step by Step Solution

1. Step 1: Write the proportion equation
   76,111.07 : 105,030.69 = 42,120.99 : x
2. Step 2: Convert to fraction form
   76,111.07/105,030.69 = 42,120.99/x
3. Step 3: Cross multiply
   76,111.07x = 105,030.69 × 42,120.99
4. Step 4: Simplify right side
   76,111.07x = 4,423,996,643.18
5. Step 5: Solve for x
   x = 4,423,996,643.18/76,111.07
6. Step 6: Final answer
   x = 58,125.53