Finding the Fourth Proportional to 712,388.32, 983,095.86 and 390,118.12

Step by Step Solution

1. Step 1: Write the proportion equation
   712,388.32 : 983,095.86 = 390,118.12 : x
2. Step 2: Convert to fraction form
   712,388.32/983,095.86 = 390,118.12/x
3. Step 3: Cross multiply
   712,388.32x = 983,095.86 × 390,118.12
4. Step 4: Simplify right side
   712,388.32x = 383,523,508,682.98
5. Step 5: Solve for x
   x = 383,523,508,682.98/712,388.32
6. Step 6: Final answer
   x = 538,362.99